diff --git a/lib/shared/require-or-import.js b/lib/shared/require-or-import.js
index 6970ae42..aa1f2e9e 100644
--- a/lib/shared/require-or-import.js
+++ b/lib/shared/require-or-import.js
@@ -12,6 +12,35 @@ try {
   importESM = null;
 }
 
+function getExt(path) {
+  // Remove trailling slash `/`
+  // and get gulpfile extension
+  var regex = /.([\w\d]+)\/*$/i;
+  return path.match(regex)[1];
+}
+
+function securePath(path) {
+  var pathStatsSync = require('fs').lstatSync;
+  var join = require('path').join;
+
+  // Avoid ERR_UNSUPPORTED_DIR_IMPORT (NodeJs >= 12)
+  var validPath = pathStatsSync(path).isDirectory() ?
+    join(path, 'index.' + getExt(path)) :
+    path;
+
+  // This is needed on Windows, because import() fails if providing a Windows file path.
+  return pathToFileURL(validPath);
+}
+
+function onImportESM(path, callback) {
+  var safePath = securePath(path);
+  importESM(safePath)
+    .then(function(modules) {
+      callback(null, modules);
+    })
+    .catch(callback);
+}
+
 function requireOrImport(path, callback) {
   var err = null;
   var cjs;
@@ -19,10 +48,7 @@ function requireOrImport(path, callback) {
     cjs = require(path);
   } catch (e) {
     if (pathToFileURL && importESM && e.code === 'ERR_REQUIRE_ESM') {
-      // This is needed on Windows, because import() fails if providing a Windows file path.
-      var url = pathToFileURL(path);
-      importESM(url).then(function(esm) { callback(null, esm); }, callback);
-      return;
+      return onImportESM(path, callback);
     }
     err = e;
   }